#pragma once

#include <iostream>
#include <string>
#include <cstdlib>
#include <sys/socket.h>
#include <unistd.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <strings.h>
#include "Log.hpp"
#include "Common.hpp"
#include "IntAddr.hpp"

namespace SocketModule
{
    using namespace LogModule;
    class Socket; //前置声明
    using SockPtr = std::shared_ptr<Socket>;

    //基类socket, 后面如果使用tcp创建或者udp创建套接字可以继承基类实现基类中的方法
    class Socket
    {
    public:
        virtual ~Socket() = default;
        virtual void SocketOrDie() = 0; //创建套接字
        virtual void SetSocketOpt() = 0;
        virtual bool BindOrDie(int port) = 0;
        virtual bool ListenOrDie() = 0;
        virtual void Close() = 0;

        virtual SockPtr Accepter(InetAddr *client) = 0;
        virtual int Recv(std::string *out) = 0;
        virtual int Send(const std::string &in) = 0;
        virtual int Fd() = 0;

        //提供一个创建listensocket的固定套路
        //端口号直接下层提供就可以,进行内核的绑定, 服务器只需要端口号
        void BuildTcpSocketMethod(int port)
        {
            //1. 创建套接字
            SocketOrDie();
            SetSocketOpt(); //TODO
            BindOrDie(port); // 2.绑定
            ListenOrDie(); //3. TCP需要打开监听状态
        }
    private:
        
    };

    class TcpSocket : public Socket
    {
    public:
        TcpSocket() :_sockfd(gdefaultsockfd)
        {}
        TcpSocket(int sockfd) : _sockfd(sockfd)
        {}
        virtual ~TcpSocket(){}

        virtual void SocketOrDie() override
        {
            _sockfd = ::socket(AF_INET, SOCK_STREAM, 0);
            if(_sockfd < 0)
            {
                LOG(LogLevel::ERROR) << "socket error";
                exit(SOCKET_ERR);
            }
            LOG(LogLevel::DEBUG) << "socket create success: " << _sockfd;
        }
        virtual void SetSocketOpt() override
        {}

        virtual bool BindOrDie(int port) override
        {
            if(_sockfd == gdefaultsockfd)
                return false;
            InetAddr addr(port);
            int n = ::bind(_sockfd, addr.Netaddr(), addr.NetAddrlen());
            if(n < 0)
            {
                LOG(LogLevel::ERROR) << "bind error";
                exit(SOCKET_ERR);
            }
            LOG(LogLevel::DEBUG) << "bind create success: " << _sockfd;
            return true;
        }

        virtual bool ListenOrDie() override
        {
            if(_sockfd == gdefaultsockfd)
                return false;
            int n = ::listen(_sockfd, gbacklog);
            if(n < 0)
            {
                LOG(LogLevel::ERROR) << "listen error";
                exit(LISTEN_ERR);
            }
            LOG(LogLevel::DEBUG) << "listen create success: " << _sockfd;
            return true;
        }

        //1.文件描述符 2.把客户端信息返回 
        virtual SockPtr Accepter(InetAddr *client)
        {
            if(!client) //如果不是空指针
                return nullptr;
            struct sockaddr_in peer; 
            socklen_t len= sizeof(peer);
            int newsockfd = ::accept(_sockfd, CONV(&peer), &len);
            if(newsockfd < 0)
            {
                LOG(LogLevel::WARNING) << "accept error";
                return nullptr;
            }
            client->SetAddr(peer, len);
            return std::make_shared<TcpSocket>(newsockfd);
        }

        virtual void Close() override
        {
            if(_sockfd == gdefaultsockfd)
                return;
            ::close;
        }

        virtual int Recv(std::string *out) override
        {
            char buffer[1024*8];
            auto size = ::recv(_sockfd, buffer, sizeof(buffer) - 1, 0);
            if(size > 0)
            {
                buffer[size] = 0;
                *out = buffer;
            }
            return size;
        }

        virtual int Send(const std::string &in) override
        {
            auto size = ::send(_sockfd, in.c_str(), in.size(), 0);
            return size;
        }

        virtual int Fd() override
        {
            return _sockfd;
        }

    private:
        int _sockfd; //创建出来的的套接字
    };
}